//
//  PlayLinkView.swift
//  SwiftPamphletApp
//
//  Created by Ming Dai on 2022/2/16.
//

import SwiftUI

struct PlayLinkView: View {
    @Environment(\.openURL) var openURL
    var aStr: AttributedString {
        var a = AttributedString("戴铭的博客")
        a.link = URL(string: "https://ming1016.github.io/")
        return a
    }
    var body: some View {
        VStack {
            // 普通
            Link("前往 www.starming.com", destination: URL(string: "http://www.starming.com")!)
                .buttonStyle(.borderedProminent)
            Link(destination: URL(string: "https://twitter.com/daiming_cn")!) {
                Label("My Twitter", systemImage: "message.circle.fill")
            }
            .onOpenURL { url in
                print(url.absoluteString)
            }
            
            // AttributedString 链接
            Text(aStr)
            
            // markdown 链接
            Text("[Go Ming's GitHub](https://github.com/ming1016)")
            
            // 控件使用 OpenURL
            Link("小册子源码", destination: URL(string: "https://github.com/ming1016/SwiftPamphletApp")!)
                .environment(\.openURL, OpenURLAction { url in
                    return .systemAction
                    /// return .handled 不会返回系统打开浏览器动作，只会处理 return 前的事件。
                    /// .discard 和 .handled 类似。
                    /// .systemAction(URL(string: "https://www.anotherurl.com")!) 可以返回另外一个 url 来替代指定的url
                })
            
            // 扩展 View 后更简洁的使用 OpenURL
            Link("戴铭的微博", destination: URL(string: "https://weibo.com/allstarming")!)
                .goOpenURL { url in
                    print(url.absoluteString)
                    return .systemAction
                }
            
            // 根据内容返回不同链接
            Text("戴铭博客有好几个，存在[GitHub Page](github)、[自建服务器](starming)和[知乎](zhihu)上")
                .environment(\.openURL, OpenURLAction { url in
                    switch url.absoluteString {
                    case "github":
                        return .systemAction(URL(string: "https://ming1016.github.io/")!)
                    case "starming":
                        return .systemAction(URL(string: "http://www.starming.com")!)
                    case "zhihu":
                        return .systemAction(URL(string: "https://www.zhihu.com/people/starming/posts")!)
                    default:
                        return .handled
                    }
                })
        } // end VStack
        .padding()
        
    }
    
    // View 支持 openURL 的能力
    func goUrl(_ url: URL, done: @escaping (_ accepted: Bool) -> Void) {
        openURL(url, completion: done)
    }
}

// 为 View 扩展一个 OpenURL 方法
extension View {
    func goOpenURL(done: @escaping (URL) -> OpenURLAction.Result) -> some View {
        environment(\.openURL, OpenURLAction(handler: done))
    }
}


